Volvo EC60E, Operator'S Manual, Page: 185 / 342

Underground cables and pipes
Make sure that authorities or companies
responsible for cables and pipes have been
contacted and that their instructions are followed.
Also check which rules apply to ground personnel
regarding exposing cables and pipes. Normally only
the service companies' own personnel may expose
and arrange provisional suspension of cables.
Make use of a signal man when you cannot see the
actual point where you are working or when the
position of the pipe or cable is critical, see page
226
. The position of the pipe or cable may deviate
from the drawing or distances may be incorrectly
determined. Regard all electrical cables as live.
184
Operating techniques
Working within dangerous areas